[Thinkpad X1C7][Thinkpad X1C8]F1 and F4 Hotkey LED Light Stays ON/OFF when USB Headset is attached.

[Miguel Imperial]

Problem Description:

Using Ubuntu 20.04 on a Thinkpad X1C7 machine.
Speaker(F1) and Microphone(F4) Hotkey LED Light Stays ON/OFF when USB Headset is attached.

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$ lsb_release -rd
Description: Ubuntu 20.04 LTS
Release: 20.04

Ubuntu Software: 3.36.1

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Expected Result:
When LED light of Speaker(F1)/Microphone (F4) hotkeys is ON/OFF and then we connect USB Headset and press Speaker(F1)/Microphone (F4) hotkeys again -> LED light state will change accordingly.

Actual Result:
1. When LED light of Speaker(F1)/Microphone (F4) hotkeys is OFF and then we connect USB Headset and press Speaker(F1)/Microphone (F4) hotkeys again -> LED light will STAY OFF and remains in OFF State always on the duration that the USB headset is attached to the machine.
2. If LED light of Speaker(F1)/Microphone (F4) hotkeys is ON and then we connect USB Headset and press Speaker(F1)/Microphone (F4) hotkeys again -> LED will STAY ON and remains in ON State on the duration that the USB headset is attached to the machine.

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: linux-image-5.4.0-33-generic 5.4.0-33.37
ProcVersionSignature: Ubuntu 5.4.0-33.37-generic 5.4.34
Uname: Linux 5.4.0-33-generic x86_64
ApportVersion: 2.20.11-0ubuntu27
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC0: ubuntu 1410 F.... pulseaudio
CasperMD5CheckResult: skip
CurrentDesktop: ubuntu:GNOME
Date: Thu May 28 18:48:04 2020
InstallationDate: Installed on 2020-05-28 (0 days ago)
InstallationMedia: Ubuntu 20.04 LTS "Focal Fossa" - Release amd64 (20200423)
MachineType: LENOVO 20U9SITR38
ProcFB: 0 i915drmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.4.0-33-generic root=UUID=ab59da99-085b-4f8d-af14-4fc4240a8f83 ro quiet splash vt.handoff=7
RelatedPackageVersions:
 linux-restricted-modules-5.4.0-33-generic N/A
 linux-backports-modules-5.4.0-33-generic N/A
 linux-firmware 1.187
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 02/12/2020
dmi.bios.vendor: LENOVO
dmi.bios.version: N2WET11C (1.01C )
dmi.board.asset.tag: Not Available
dmi.board.name: 20U9SITR38
dmi.board.vendor: LENOVO
dmi.board.version: Not Defined
dmi.chassis.asset.tag: No Asset Information
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: None
dmi.modalias: dmi:bvnLENOVO:bvrN2WET11C(1.01C):bd02/12/2020:svnLENOVO:pn20U9SITR38:pvrThinkPadX1CarbonGen8:rvnLENOVO:rn20U9SITR38:rvrNotDefined:cvnLENOVO:ct10:cvrNone:
dmi.product.family: ThinkPad X1 Carbon Gen 8
dmi.product.name: 20U9SITR38
dmi.product.sku: LENOVO_MT_20U9_BU_Think_FM_ThinkPad X1 Carbon Gen 8
dmi.product.version: ThinkPad X1 Carbon Gen 8
dmi.sys.vendor: LENOVO

[Ubuntu Kernel Bot (ubuntu-kernel-bot)]

This change was made by a bot.

[Jason Yen (jasonyen)]

@Miguel,

Thanks for the report of this issue. This is a known issue/limitation that the USB peripheral driver is not in sync of the Hotkey LED status. The Hotkey LED should connect to the audio codec by GPIO.

We will check with the Desktop team to see if we can do some improvement in the future.

[Chi-Wei Chen (cchen50)]

@Jasonyen,
We just noticed that the F1 mute LED issue is also encountered for External Monitor Speaker on X1C9.
Is it the same limitation as this ticket or it would be better to raise another ticket to discuss?